Gears, bearing, seals, labor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**DANTIP** · 09-29-2009, 08:25 AM

I am trying to compare ideas to reduce highway RPM and want help determining the cost to change gear sets back to the original 3.08:1 ratio in my 72 C-10. I suspect a PO put 3.73:1 gears onto the original 3-series carrier (because the code on the housing is correct for 3.08:1). If they didn't change the carrier I should be able to change the gear set out and use the existing carrier. I would probably order a complete kit including seals, bearings, gears and install kit. I am hoping to get good ball-park cost estimates to do this two ways. First price is if I do the work myself, and the second price if I have it done professionally. Lastly, if I need a carrier and opt for a new Eaton 3-series posi how much labor would the carrier change add if any?

Thanks!

**70cst** · 09-29-2009, 08:34 AM

Quote:

Originally Posted by DANTIP

I am trying to compare ideas to reduce highway RPM and want help determining the cost to change gear sets back to the original 3.08:1 ratio in my 72 C-10. I suspect a PO put 3.73:1 gears onto the original 3-series carrier (because the code on the housing is correct for 3.08:1). If they didn't change the carrier I should be able to change the gear set out and use the existing carrier. I would probably order a complete kit including seals, bearings, gears and install kit. I am hoping to get good ball-park cost estimates to do this two ways. First price is if I do the work myself, and the second price if I have it done professionally. Lastly, if I need a carrier and opt for a new Eaton 3-series posi how much labor would the carrier change add if any?
Thanks!

Good post...I have the same issue to deal with. It would be interesting to know what mpg difference one might expect between a 3:73 verses a 3:08?

**Boog** · 09-29-2009, 08:37 AM

A rough estimate is about $500 parts and labor to have it changed for you. If you go with the eaton posi of course it will be more.

You can use one of those online gear ratio calculators to get an idea of the rpm difference for each ratio and see how much rpm drop you will see from one to the other. I use www.richmondgear.com to compare.

cdowns · 09-29-2009, 09:03 AM

try getting a price from local guy parts and labor//some guys dont like installing your parts and sometimes theres not a savings by doing the online parts thing

smoky02 · 09-29-2009, 09:07 AM

Here in Fort Walton Beach Florida, I ordered my gears and install kit from Summit for around $300, the shop that I called said they would charge about $400 for the install. A little more if they have to rebuild my stock carrier. And those numbers are as of yesterday.

PanelDeland · 09-29-2009, 07:43 PM

If you've never set up a rear end you need someone with the tools and know how to show you.You may have it apart several times to get it set right.
Check your local 4X4 shops since they do a lot of this stuff.
The $$$ effective choice would be to find a 3;08 in a JY and swap it in.

09-29-2009, 08:25 AM	#1
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,883	Gears, bearing, seals, labor I am trying to compare ideas to reduce highway RPM and want help determining the cost to change gear sets back to the original 3.08:1 ratio in my 72 C-10. I suspect a PO put 3.73:1 gears onto the original 3-series carrier (because the code on the housing is correct for 3.08:1). If they didn't change the carrier I should be able to change the gear set out and use the existing carrier. I would probably order a complete kit including seals, bearings, gears and install kit. I am hoping to get good ball-park cost estimates to do this two ways. First price is if I do the work myself, and the second price if I have it done professionally. Lastly, if I need a carrier and opt for a new Eaton 3-series posi how much labor would the carrier change add if any? Thanks!

09-29-2009, 08:37 AM	#3
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,183	Re: Gears, bearing, seals, labor A rough estimate is about $500 parts and labor to have it changed for you. If you go with the eaton posi of course it will be more. You can use one of those online gear ratio calculators to get an idea of the rpm difference for each ratio and see how much rpm drop you will see from one to the other. I use www.richmondgear.com to compare. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 09-29-2009 at 08:44 AM. Reason: add a link

09-29-2009, 09:03 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Gears, bearing, seals, labor try getting a price from local guy parts and labor//some guys dont like installing your parts and sometimes theres not a savings by doing the online parts thing __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-29-2009, 09:07 AM	#5
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: Gears, bearing, seals, labor Here in Fort Walton Beach Florida, I ordered my gears and install kit from Summit for around $300, the shop that I called said they would charge about $400 for the install. A little more if they have to rebuild my stock carrier. And those numbers are as of yesterday. __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

09-29-2009, 07:43 PM	#6
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: Gears, bearing, seals, labor If you've never set up a rear end you need someone with the tools and know how to show you.You may have it apart several times to get it set right. Check your local 4X4 shops since they do a lot of this stuff. The $$$ effective choice would be to find a 3;08 in a JY and swap it in. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"



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